The games, which are currently underway in Orlando, triggered a memory from Harry's childhood. Twenty-plus years ago, the impressionable young prince visited the city to go to Disney World with his late mother and his older brother, Prince William. On Monday, CBS host Norah O'Donnell presented Harry with a photo of himself grinning in the front row of a log on Splash Mountain while his mom sat in the back with friends. (In an interview with Good Morning America last month, Harry revealed that he "went on Space Mountain 14 times" and thought, at age 9, that it was the "best thing ever.)

"All those years ago. I tell you what," he said as he smiled at the picture. "If you sit in the front you don't get as wet, by the looks of things in that photo … We had happy, happy memories. You know, it was absolutely fantastic. And it's so nice to be back here … with all these guys as well."

Prince Harry, front row left, and family friend Harry Soames, right, ride of Splash Mountain at Walt Disney World in Lake Buena Vista, Florida on Thursday, August 26, 1993. Riding at back right is Princess Diana.AP Images

The royal then thought about how his late mother would have reacted to the Invictus Games, which First Lady Michelle Obama and former president George W. Bush and his wife, Laura Bush, attended on opening night.

"I'd hope she'd be, you know, incredibly proud," Prince Harry said of his beloved mum, who died at age 36 in an August 1997 car crash. "I hope she'd be sitting up there having her own little party. And looking down thinking [about] what we've achieved, 'cause it's a massive team effort. What we've achieved is absolutely brilliant."

Harry also opened up to the Today show on Monday about Diana. "It's a huge shame that she's not here," he said on Monday in an interview with Jenna Bush Hager. "But I hope she'd be incredibly proud of what we've managed to achieve."